diff --git a/README.md b/README.md
index be64539..abded65 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,11 @@ Install Go language (golang), guidelines at:
   * https://golang.org
   * https://golang.org/doc/install
 
-**Note**: When using Go version 1.16 or later, it's necessary to set the environment variable `GO111MODULE` to `off` prior to executing the `go get` or `make` commands below. When using an `sh`-compatible shell, this can be accomplished with `export GO111MODULE=off`
+**Note**: When using Go version 1.16 or later, it's necessary to set the environment variable
+`GO111MODULE` to `off` prior to executing the `go get` or `make` commands below. When using an
+`sh`-compatible shell, this can be accomplished with `export GO111MODULE=off`. If fails when
+using `GO111MODULE=off`, try with `GO111MODULE=on`.
+
 
 ***